77
Method of Combined Branching of Lines and
Headers
Connection Examples
(Connecting to Five Indoor Units)
Liquid Line
Gas Line
Piping Diameter (mm)
Model
PUMY-P125
{
9.52
{
19.05
Liquid Line (mm)
Gas Line (mm)
Downstream Unit Model Total
80 or less
80 or more
{
15.88
{
19.05
{
9.52
{
9.52
Liquid Line
Gas Line
Liquid Line
Gas Line
Liquid Line
Gas Line
Piping Diameter (mm)
Model number
40 or lower
50 to 80
100,125
{
6.35
{
12.7
{
9.52
{
15.88
{
9.52
{
19.05
Outdoor unit
First branching (branching
joint)
Branching joint
Indoor unit
Branching header
To downstream unit
Blind caps
A
B
C
D
E
F
G
A+B+C+a+b+c+d+e is 100 meters or less
A+B+b is 70 meters or less
B+b is 30 meters or less
30 meters or less (If the outdoor unit is lower, 20 meters or less)
12 meters or less
Please select branching kit, which is sold separately, from the table below.
(The kit comprises sets for use with liquid pipes and for use with gas pipes.)
Total Piping Length
Farthest Piping Length
Farthest Piping Length After First Branch
High/Low Difference in Indoor/Outdoor Section
High/Low Difference in Indoor/Indoor Section
Permissible
Length
Permissible High/
Low Difference
(L)
(
R
)
(H)
(h)
■
Selecting the Refrigerant Branch Kit
■
Select Each Section of Refrigerant Piping
■
Additional refrigerant charge
Select the size from the table to the right.
(1) Refrigerant Piping Diameter In Section
From Outdoor Unit to First Branch (Out-
door Unit Piping Diameter)
(1) Section From Outdoor Unit
to First Branch (A)
(2) Sections From Branch to
Indoor Unit (a,b,c,d,e)
(3) Section From Branch to
Branch (B,C)
(3) Refrigerant Piping Diameter In Section
From Branch to Branch
(2) Refrigerant Piping Diameter In Section
From Branch to Indoor Unit (Indoor Unit
Piping Diameter)
Each
Section of
Piping
• Refrigerant of 3kg equivalent to 50-m total
extended piping length is already included
when the outdoor unit is shipped.
Thus, if the total extended piping length is
50m or less, there is no need to charge with
additional refrigerant.
• If the total extended piping length exceeds
50m, calculate the required additional
refrigerant charge using theprocedure shown
on the right.
• If the calculated additional refrigerant charge
is a negative amount, do not charge with any
refrigerant.
<Additional Charge>
<Example>
Indoor 1 : 50
A :
{
9.52 10m
a :
{
9.52
5m
2 : 40
B :
{
9.52 20m
b :
{
6.35
10m
3 : 32
C :
{
9.52 10m
c :
{
6.35
5m
4 : 20
d :
{
6.35
5m
5 : 20
e :
{
6.35
5m
The total length of each liquid line is as follows
{
9.52 : A + B + C + a = 10 + 20 +10 + 5 = 45m
{
6.35 : b + c + d + e = 10 + 5 + 5 + 5 = 25m
Therefore,
<Calculation example>
Additional
refrigerant charge = 45
✕
0.06 + 25
✕
0.024 – 3.0 = 0.3kg (rounded up)
Additional
refrigerant charge
(kg)
Liquid pipe size
Total length of
{
9.52
✕
0.06
(m)
✕
0.06 (kg/m)
=
Liquid pipe size
Total length of
{
6.35
✕
0.024
(m)
✕
0.024 (kg/m)
+
Refrigerant
amount for outdoor
unit
125: 3.0kg
–
At the conditions
below:
Branch Joint
CMY-Y62-C-E
Branch Header (4 branches)
CMY-Y64-C
Branch Header (8 branches)
CMY-Y68
A
F
B
A
E
G
C
D
D
D
D
D
A
C
b
B
3
H
h
4
L
R
5
1
2
c
d
e
a
Note: Pipe re-branching after the header branching
is not possible.
Note: The total of downstream unit models in the
table is the total of models as seen from point
A in the figure above.
OC272A--3.qxp 03.9.4 11:10 AM Page 77
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